Online open day datesWatch
Student life, in partnership with UEA
Another option would be to visit the area at other times of the year. I know a university near me does tours of the campus on a reasonably regular basis (or at least they did before Coronavirus) -- although of course there aren't any displays or presentations, it's just a walk around campus led by a current student (you might not be able to go into any buildings). It does at least give you a chance to see where you'll be spending three years of your life if you go there, and to ask questions of someone who already is there.
You could also just visit the campus on a day trip just to get a feel of the area; again, though, you wouldn't be able to go into any buildings.
It's a shame they're all on the same day However, you could email each uni to ask for the schedule for the day. This way you can prioritise the course talks for each uni and hopefully there wont be an overlap. You can also ask if any sessions are recorded so that you can watch them and not miss out.
Sam- Official Student Rep